html,body{
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

body{
  background:url("img/background.jpg");
  background-size:100% 100%;
  
  font-size:15px;
}

h2{
  font-size: 1.8em;
  color: rgb(62, 85, 121);
}

h3{
  font-size: 1.5em;
  color: rgb(90, 124, 179);
  margin: 10px 0;
}

p{
  font-size: 1.5em;
  line-height: 1.7em;
  color: rgb(45, 45, 53);
  margin: 0.5em 0;
}

i{
  font-size: 1.5em;
  color: rgb(62, 106, 209);
  line-height: 1.7em;
  margin: 1em 0;
  
}

#content{
  margin:12em 18em; 
}

.content_small_img > img{
  border-radius: 6px;
  width: 10em;
  margin:0.5em;
}

.big_pic{
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  display: grid;
  place-items: center;
  background: #333d;
}

.red{
  color: rgb(245, 46, 46);
}

.blue{
  color: rgb(15, 140, 241);
}

.right_top{
  display: inline-block;
  position: absolute;
  top:10px;
  right: 10px;
}

.right_top>input{
  visibility: hidden;
  border:1px solid #ddd;
  border-radius: 5px;
  padding: 10px;
  background-color: #ddd6;
}

#config_font_size{
  position: absolute;
  right: 0;
  top:0;
  width: 20px;
  height: 20px;
  background-color: #fff1;
}

#open_menu{
  position: absolute;
  left:10px;
  top:10px;
  width: 20px;
  height: 20px;
  background-color: #fff1;
}

#left_menu{
  position: absolute;
  top:0;
  width: 200px;
  height: 100%;
  background-color: #3336;
  padding:0 20px;
}

#left_menu h2{
  font-size:16px;
  color: #fff;
  cursor: pointer;
}

.pic_page{
  width: 100%;
}

.big_word{
  color:red;
  font-weight: bold;
  font-size:4em;
  text-align: center;
}
